<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box{
        width: 200px;
        height: 200px;
        transition: all 2s;
        background-image: url(./weixin.png);
        background-size: cover;
        background-repeat: no-repeat;
        border-radius: 50%;
    }
    .box:hover{
       /* transform: rotateY(180deg);*/
       transform: skew(20deg,-40deg);
    }
</style>
<body>
    <div class="box"></div>
</body>
</html>